#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include <math.h>

//P735
int main35()
{
	printf("Input a side of triangle:");
	int a = 0;
	scanf("%d", &a);
	float p = (3 * a) / (float)2;
	float area = (float)(sqrt(( p - a)*(p - a)*(p - a) * p));
	int circle = 3 * a;
	printf("\nThe area of triangle is %.2f ,the circle of triangle is %d. ", area, circle);

	return 0;
}
